20401171 has 16 divisors (see below), whose sum is σ = 24120576. Its totient is φ = 16890336.

The previous prime is 20401141. The next prime is 20401217. The reversal of 20401171 is 17110402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20401171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58620 + ... + 58966.

It is an arithmetic number, because the mean of its divisors is an integer number (1507536).

Almost surely, 2^20401171 is an apocalyptic number.

20401171 is a deficient number, since it is larger than the sum of its proper divisors (3719405).

20401171 is a wasteful number, since it uses less digits than its factorization.

20401171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 20401171 is about 4516.7655462731. The cubic root of 20401171 is about 273.2446696693.

Adding to 20401171 its reverse (17110402), we get a palindrome (37511573).

The spelling of 20401171 in words is "twenty million, four hundred one thousand, one hundred seventy-one".